WO2018131947A1 - Procédé de fonctionnement de communication véhicule-à-toute-entité (v2x) exécuté par un terminal v2x dans un système de communication sans fil et terminal l'utilisant - Google Patents

Procédé de fonctionnement de communication véhicule-à-toute-entité (v2x) exécuté par un terminal v2x dans un système de communication sans fil et terminal l'utilisant Download PDF

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Publication number
WO2018131947A1
WO2018131947A1 PCT/KR2018/000640 KR2018000640W WO2018131947A1 WO 2018131947 A1 WO2018131947 A1 WO 2018131947A1 KR 2018000640 W KR2018000640 W KR 2018000640W WO 2018131947 A1 WO2018131947 A1 WO 2018131947A1
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WIPO (PCT)
Prior art keywords
terminal
cbr
resource
communication
changed
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PCT/KR2018/000640
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English (en)
Korean (ko)
Inventor
이승민
서한별
채혁진
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엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020197018556A priority Critical patent/KR102524101B1/ko
Priority to US16/477,162 priority patent/US10939469B2/en
Priority to CN201880008932.7A priority patent/CN110249690B/zh
Priority to EP18738639.6A priority patent/EP3554172B1/fr
Publication of WO2018131947A1 publication Critical patent/WO2018131947A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W74/00—Wireless channel access
    • H04W74/08—Non-scheduled access, e.g. ALOHA
    • H04W74/0808—Non-scheduled access, e.g. ALOHA using carrier sensing, e.g. carrier sense multiple access [CSMA]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/16—Central resource management; Negotiation of resources or communication parameters, e.g. negotiating bandwidth or QoS [Quality of Service]
    • H04W28/26—Resource reservation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/20—Manipulation of established connections
    • H04W76/27—Transitions between radio resource control [RRC] states
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/005—Discovery of network devices, e.g. terminals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W92/00—Interfaces specially adapted for wireless communication networks
    • H04W92/16—Interfaces between hierarchically similar devices
    • H04W92/18—Interfaces between hierarchically similar devices between terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup

Definitions

  • the present invention relates to wireless communication, and more particularly, to a method for performing V2X communication performed by a V2X terminal in a wireless communication system and a terminal using the method.
  • ITU-R International Telecommunication Union Radio communication sector
  • IP Internet Protocol
  • 3rd Generation Partnership Project is a system standard that meets the requirements of IMT-Advanced.
  • Long Term Evolution is based on Orthogonal Frequency Division Multiple Access (OFDMA) / Single Carrier-Frequency Division Multiple Access (SC-FDMA) transmission.
  • OFDMA Orthogonal Frequency Division Multiple Access
  • SC-FDMA Single Carrier-Frequency Division Multiple Access
  • LTE-A LTE-Advanced
  • LTE-A is one of the potential candidates for IMT-Advanced.
  • D2D Device-to-Device
  • D2D is drawing attention as a communication technology for a public safety network.
  • Commercial communication networks are rapidly changing to LTE, but current public safety networks are mainly based on 2G technology in terms of cost and conflict with existing communication standards. This gap in technology and the need for improved services have led to efforts to improve public safety networks.
  • V2X VEHICLE-TO-EVERYTHING
  • PEDESTRIAN COMPUNICATION BETWEEN A VEHICLE AND A DEVICE CARRIED BY AN INDIVIDUAL (e.g., HANDHELD TERMINAL CARRIED BY A PEDESTRIAN, CYCLIST, DRIVER OR PASSENGER), where V2X can be referred to as V2P).
  • V2V VEHICLE
  • INFRASTRUCTURE / NETWORK COMPONENT BETWEEN A VEHICLE AND A ROADSIDE UNIT (RSU) / NETWORK (e.g.) OR A STATIONARY UE))
  • V2I / N A device possessed by a pedestrian (or person) is named "P-UE”, and a device installed in a vehicle VEHICLE (V2X communication) is named "V-UE”.
  • the term 'entity' may be interpreted as at least one of P-UE, V-UE, and RSU (/ NETWORK / INFRASTRUCTURE).
  • the V2X terminal may perform V2X communication through resource reservation based on the CBR. In this case, when resource reservation is performed once by the V2X terminal, it may take a long time until the resource is rebooked.
  • the CBR may change even after resource reservation is performed.
  • the V2X terminal when the V2X terminal performs resource reservation based on the CBR, the V2X terminal had to perform V2X communication based on the CBR before the change for a while even when the CBR changed after the resource reservation.
  • the terminal when the terminal performs V2X communication based on the existing CBR even after the CBR is changed, when the CBR is increased after resource reservation (for example, the ratio of subchannels occupied by other terminals after resource reservation is increased). Also, since the terminal performs V2X communication based on the CBR before the change, the possibility that the V2X communication of the terminal is interrupted by the V2X communication of another terminal may increase.
  • the present invention provides a method for performing V2X communication by reflecting the changed CBR when the CBR is changed, and an apparatus using the same.
  • the present invention has been made in an effort to provide a method for performing V2X communication performed by a V2X terminal in a wireless communication system and a terminal using the same.
  • a V2X operation method performed by a vehicle-to-X (V2X) terminal in a wireless communication system it is determined whether a channel busy ratio (CBR) value is changed after resource reservation is performed. And perform V2X communication based on the determination, and if the CBR value is changed after the resource reservation is performed, performing the V2X communication based on the changed CBR value. Can be.
  • CBR channel busy ratio
  • the V2X terminal may perform the V2X communication based on the changed frequency resource.
  • the V2X terminal may perform the V2X communication based on the reduced frequency resource.
  • the V2X terminal may perform the V2X communication based on the reduced frequency resource and the existing time resource.
  • the V2X terminal may perform the V2X communication based on a subset of existing frequency resources or existing time resources.
  • the V2X terminal may perform the allowed number of transmissions using a subset of resources reserved in the existing period.
  • the V2X terminal may signal change information of a transmission period.
  • the V2X terminal may signal information on whether to retransmit.
  • the V2X terminal may signal information on the remaining transmission number.
  • the V2X terminal may determine that the CBR value is changed after the resource reservation is performed.
  • the V2X terminal may perform the V2X communication based on the changed CBR value.
  • a vehicle-to-X (V2X) user equipment includes a radio frequency (RF) unit for transmitting and receiving a radio signal and a processor operating in combination with the RF unit.
  • the processor may determine whether a Channel Busy Ratio (CBR) value has changed after resource reservation is performed, and perform V2X communication based on the determination, but after the resource reservation is performed, the CBR value.
  • the terminal may perform the V2X communication based on the changed CBR value.
  • CBR Channel Busy Ratio
  • the terminal since the terminal performs V2X communication based on the changed CBR, the possibility that the V2X communication of the terminal is interrupted by the V2X communication of another terminal may be lowered.
  • the present invention according to the change of the CBR measurement value, it is possible to alleviate the problem of excessive resource re-scheduling operation (/ triggering) (for example, the problem of a high probability of (reserved) resource collision between terminals). .
  • FIG. 1 illustrates a wireless communication system to which the present invention can be applied.
  • 3 shows examples of arrangement of terminals and cell coverage for ProSe direct communication.
  • 4 shows a user plane protocol stack for ProSe direct communication.
  • FIG. 6 schematically illustrates an example for a CBR.
  • FIG. 7 is a flowchart illustrating a method of performing V2X communication according to an embodiment of the present invention.
  • FIG. 8 is a flowchart illustrating an example of a method of performing V2X communication according to the proposed method # 1.
  • FIG. 9 schematically illustrates an example of a configuration for limiting frequency resources in the proposal method # 1.
  • FIG. 10 is a flowchart illustrating an example of a method of performing V2X communication according to the proposed method # 2.
  • 11 is a flowchart illustrating an example of a method of performing V2X communication according to the proposed method # 3.
  • FIG. 12 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.
  • E-UTRAN Evolved-UMTS Terrestrial Radio Access Network
  • LTE Long Term Evolution
  • the E-UTRAN includes a base station (BS) 20 that provides a control plane and a user plane to a user equipment (UE).
  • the terminal 10 may be fixed or mobile and may be called by other terms such as a mobile station (MS), a user terminal (UT), a subscriber station (SS), a mobile terminal (MT), a wireless device (Wireless Device), and the like.
  • the base station 20 refers to a fixed station communicating with the terminal 10, and may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like.
  • eNB evolved-NodeB
  • BTS base transceiver system
  • access point and the like.
  • the base stations 20 may be connected to each other through an X2 interface.
  • the base station 20 is connected to a Serving Gateway (S-GW) through an MME (Mobility Management Entity) and an S1-U through an Evolved Packet Core (EPC) 30, more specifically, an S1-MME through an S1 interface.
  • S-GW Serving Gateway
  • MME Mobility Management Entity
  • EPC Evolved Packet Core
  • EPC 30 is composed of MME, S-GW and P-GW (Packet Data Network-Gateway).
  • the MME has information about the access information of the terminal or the capability of the terminal, and this information is mainly used for mobility management of the terminal.
  • S-GW is a gateway having an E-UTRAN as an endpoint
  • P-GW is a gateway having a PDN as an endpoint.
  • Layers of the Radio Interface Protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems.
  • L2 second layer
  • L3 third layer
  • the RRC Radio Resource Control
  • the RRC layer located in the third layer plays a role of controlling radio resources between the terminal and the network. To this end, the RRC layer exchanges an RRC message between the terminal and the base station.
  • ProSe proximity based services
  • ProSe has ProSe communication and ProSe direct discovery.
  • ProSe direct communication refers to communication performed between two or more neighboring terminals.
  • the terminals may perform communication using a user plane protocol.
  • ProSe-enabled UE refers to a terminal that supports a procedure related to the requirements of ProSe.
  • ProSe capable terminals include both public safety UEs and non-public safety UEs.
  • the public safety terminal is a terminal that supports both a public safety-specific function and a ProSe process.
  • a non-public safety terminal is a terminal that supports a ProSe process but does not support a function specific to public safety.
  • ProSe direct discovery is a process for ProSe capable terminals to discover other ProSe capable terminals that are adjacent to each other, using only the capabilities of the two ProSe capable terminals.
  • EPC-level ProSe discovery refers to a process in which an EPC determines whether two ProSe capable terminals are in proximity and informs the two ProSe capable terminals of their proximity.
  • ProSe direct communication may be referred to as D2D communication
  • ProSe direct discovery may be referred to as D2D discovery.
  • the reference structure for ProSe includes a plurality of terminals including an E-UTRAN, an EPC, and a ProSe application program, a ProSe application server, and a ProSe function.
  • EPC represents the E-UTRAN core network structure.
  • the EPC may include MME, S-GW, P-GW, policy and charging rules function (PCRF), home subscriber server (HSS), and the like.
  • PCRF policy and charging rules function
  • HSS home subscriber server
  • ProSe application server is a user of ProSe ability to create application functions.
  • the ProSe application server may communicate with an application program in the terminal.
  • An application program in the terminal may use a ProSe capability for creating an application function.
  • the ProSe function may include at least one of the following, but is not necessarily limited thereto.
  • PC1 This is a reference point between a ProSe application in a terminal and a ProSe application in a ProSe application server. This is used to define signaling requirements at the application level.
  • PC2 Reference point between ProSe application server and ProSe function. This is used to define the interaction between the ProSe application server and ProSe functionality. An application data update of the ProSe database of the ProSe function may be an example of the interaction.
  • PC3 Reference point between the terminal and the ProSe function. Used to define the interaction between the UE and the ProSe function.
  • the setting for ProSe discovery and communication may be an example of the interaction.
  • PC4 Reference point between the EPC and ProSe functions. It is used to define the interaction between the EPC and ProSe functions. The interaction may exemplify when establishing a path for 1: 1 communication between terminals, or when authenticating a ProSe service for real time session management or mobility management.
  • PC5 Reference point for using the control / user plane for discovery and communication, relay, and 1: 1 communication between terminals.
  • PC6 Reference point for using features such as ProSe discovery among users belonging to different PLMNs.
  • SGi can be used for application data and application level control information exchange.
  • ProSe direct communication is a communication mode that allows two public safety terminals to communicate directly through the PC 5 interface. This communication mode may be supported both in the case where the terminal receives service within the coverage of the E-UTRAN or in the case of leaving the coverage of the E-UTRAN.
  • 3 shows examples of arrangement of terminals and cell coverage for ProSe direct communication.
  • UEs A and B may be located outside the cell coverage.
  • UE A may be located within cell coverage and UE B may be located outside cell coverage.
  • UEs A and B may both be located within a single cell coverage.
  • UE A may be located within the coverage of the first cell and UE B may be located within the coverage of the second cell.
  • ProSe direct communication may be performed between terminals in various locations as shown in FIG.
  • IDs may be used for ProSe direct communication.
  • Source Layer-2 ID This ID identifies the sender of the packet on the PC 5 interface.
  • Destination Layer-2 ID This ID identifies the target of the packet on the PC 5 interface.
  • SA L1 ID This ID is the ID in the scheduling assignment (SA) in the PC 5 interface.
  • 4 shows a user plane protocol stack for ProSe direct communication.
  • the PC 5 interface is composed of a PDCH, RLC, MAC and PHY layers.
  • the MAC header may include a source layer-2 ID and a destination layer-2 ID.
  • a ProSe capable terminal can use the following two modes for resource allocation for ProSe direct communication.
  • Mode 1 is a mode for scheduling resources for ProSe direct communication from a base station.
  • the UE In order to transmit data in mode 1, the UE must be in an RRC_CONNECTED state.
  • the terminal requests the base station for transmission resources, and the base station schedules resources for scheduling allocation and data transmission.
  • the terminal may transmit a scheduling request to the base station and may transmit a ProSe BSR (Buffer Status Report). Based on the ProSe BSR, the base station determines that the terminal has data for ProSe direct communication and needs resources for this transmission.
  • ProSe BSR Buffer Status Report
  • Mode 2 is a mode in which the terminal directly selects a resource.
  • the terminal selects a resource for direct ProSe direct communication from a resource pool.
  • the resource pool may be set or predetermined by the network.
  • the terminal when the terminal has a serving cell, that is, the terminal is in the RRC_CONNECTED state with the base station or located in a specific cell in the RRC_IDLE state, the terminal is considered to be within the coverage of the base station.
  • mode 2 may be applied. If the terminal is in coverage, mode 1 or mode 2 may be used depending on the configuration of the base station.
  • the terminal may change the mode from mode 1 to mode 2 or from mode 2 to mode 1 only when the base station is configured.
  • ProSe direct discovery refers to a procedure used by a ProSe capable terminal to discover other ProSe capable terminals, and may also be referred to as D2D direct discovery or D2D discovery. At this time, the E-UTRA radio signal through the PC 5 interface may be used. Information used for ProSe direct discovery is referred to as discovery information hereinafter.
  • the PC 5 interface is composed of a MAC layer, a PHY layer, and a higher layer, ProSe Protocol layer.
  • the upper layer deals with the permission for the announcement and monitoring of discovery information, and the content of the discovery information is transparent to the access stratum (AS). )Do.
  • the ProSe Protocol ensures that only valid discovery information is sent to the AS for the announcement.
  • the MAC layer receives discovery information from a higher layer (ProSe Protocol).
  • the IP layer is not used for sending discovery information.
  • the MAC layer determines the resources used to announce the discovery information received from the upper layer.
  • the MAC layer creates a MAC protocol data unit (PDU) that carries discovery information and sends it to the physical layer.
  • PDU MAC protocol data unit
  • the base station provides the UEs with a resource pool configuration for discovery information announcement.
  • This configuration may be included in a system information block (SIB) and signaled in a broadcast manner.
  • SIB system information block
  • the configuration may be provided included in a terminal specific RRC message.
  • the configuration may be broadcast signaling or terminal specific signaling of another layer besides the RRC message.
  • the terminal selects a resource from the indicated resource pool by itself and announces the discovery information using the selected resource.
  • the terminal may announce the discovery information through a randomly selected resource during each discovery period.
  • the UE in the RRC_CONNECTED state may request a resource for discovery signal announcement from the base station through the RRC signal.
  • the base station may allocate resources for discovery signal announcement with the RRC signal.
  • the UE may be allocated a resource for monitoring the discovery signal within the configured resource pool.
  • the base station 1) may inform the SIB of the type 1 resource pool for discovery information announcement.
  • ProSe direct UEs are allowed to use the Type 1 resource pool for discovery information announcement in the RRC_IDLE state.
  • the base station may indicate that the base station supports ProSe direct discovery through 2) SIB, but may not provide a resource for discovery information announcement. In this case, the terminal must enter the RRC_CONNECTED state for the discovery information announcement.
  • the base station may set whether the terminal uses a type 1 resource pool or type 2 resource for discovery information announcement through an RRC signal.
  • the D2D operation may have various advantages in that it transmits and receives signals between adjacent devices.
  • the D2D user equipment has a high data rate and low delay and can perform data communication.
  • the D2D operation may distribute traffic that is driven to the base station, and may also serve to extend coverage of the base station if the terminal performing the D2D operation serves as a relay.
  • the above-mentioned extension of D2D communication, including the transmission and reception of signals between vehicles, is particularly referred to as V2X (VEHICLE-TO-X) communication.
  • V2X V2X
  • PEDESTRIAN COMPUNICATION BETWEEN A VEHICLE AND A DEVICE CARRIED BY AN INDIVIDUAL (example) HANDHELD TERMINAL CARRIED BY A PEDESTRIAN, CYCLIST, DRIVER OR PASSENGER)
  • V2P VEHICLE
  • V2V VEHICLE
  • INFRASTRUCTURE / NETWORK COMPIT
  • RSU ROADSIDE UNIT
  • RSU ROADSIDE UNIT
  • NETWORK example
  • a device (related to V2P communication) possessed by a pedestrian (or person) is called “P-UE", and a device (related to V2X communication) installed in VEHICLE is " V-UE ".
  • the term 'ENTITY' may be interpreted as P-UE and / or V-UE and / or RSU (/ NETWORK / INFRASTRUCTURE).
  • the V2X terminal may perform message (or channel) transmission on a predefined (or signaled) resource pool (RESOURCE POOL).
  • the resource pool may mean a predefined resource (s) to perform the V2X operation (or to perform the V2X operation).
  • the resource pool may be defined in terms of time-frequency, for example.
  • mode 3 may correspond to a scheduling mode by a base station
  • mode 4 may correspond to a terminal autonomous scheduling mode.
  • the terminal according to mode 4 may determine a transmission resource based on sensing, and then perform V2X communication through the determined transmission resource.
  • the V2X terminal may perform V2X communication based on sensing.
  • the V2X terminal may perform V2X communication based on a channel busy ratio (CHANNEL BUSY RATIO; CBR), and the V2X terminal may perform V2X communication based on a channel occupancy ratio (CHANNEL OCCUPANCY RATIO; CR).
  • CBR channel busy ratio
  • CHANNEL OCCUPANCY RATIO CR
  • CR channel occupancy ratio
  • CBR may be defined in connection with congestion measurement through PC5 in V2X terminals (ie, V-UEs).
  • CBR may refer to a portion of sub-channels in which S-RSSI observed for a specific time (eg, 100 ms) exceeds a preset threshold.
  • S-RSSI observed for a specific time
  • only subchannels included in the resource pool may be used for measurement.
  • the base station may indicate the set of resources for the terminal to perform the above measurement.
  • the measurement may be pool specific.
  • the terminal can measure the current transmission pool of at least one terminal.
  • the V2X terminal may measure all resource pools as a transmission pool.
  • the selection for the set of values of allowed radio layer parameters RADIO LAYER PARAMETERs may support congestion control.
  • base station auxiliary and terminal autonomous transmission parameter setting may be supported.
  • transmission parameter setting (or resetting) based on CBR and priority may be supported.
  • CR may be defined as the total number of subchannels used by transmission of the terminal divided by the total number of subchannels set in the measurement interval (for example, 1000 ms).
  • the set of radio layer parameters for which values allowed by congestion control may be limited may be as follows.
  • the maximum transmission power including zero power transmission
  • the range of the number of retransmissions per transmission block (TB) the physical sidelink control channel (PSSCH) number of RBs (depending on the subchannel size)
  • the modulation coding scheme (MCS) Information regarding the range of, and / or the maximum limit CR_limit on the occupancy rate and the like may be limited.
  • the lookup table may be linked with the CBR range together with the values of transmission parameters for each ProSe Per-Packet Priority (PPPP).
  • PPPP ProSe Per-Packet Priority
  • the lookup table may be set or preset, and may be supported up to a maximum of 16 CBR.
  • the CBR measured in subframe n may be defined as follows.
  • a predetermined threshold value (Portion) Can mean.
  • a S-RSSI measured by the UE may mean a portion of a subchannel in a resource pool detected as having exceeded a preset threshold.
  • the PSCCH pool is composed of resources having the size of two consecutive Physical Resource Block (PRB) pairs in the frequency domain.
  • PRB Physical Resource Block
  • CBR may be applied at the RRC_IDLE intra frequency, the RRC_IDLE inter frequency, the RRC_CONNECTED intra frequency, and / or the RRC_CONNECTED inter frequency.
  • the subframe index may be based on a physical subframe index.
  • FIG. 6 schematically illustrates an example for a CBR.
  • CBR may refer to the number of subchannels having a threshold value greater than a preset threshold value as a result of measuring a RSSI (Received Signal Strength Indicator) in units of subchannels for 100 ms. have. That is, CBR may refer to a ratio of subchannels having a value equal to or greater than a preset threshold value among subchannels during a specific period. For example, in FIG. 6, when it is assumed that a hatched subchannel is a subchannel having a value equal to or greater than a preset threshold value, CBR may refer to a ratio of subchannels that are hatched for 100 ms intervals.
  • RSSI Receiveived Signal Strength Indicator
  • CR evaluated in subframe n may be defined as follows.
  • the number of subchannels used for transmission of the UE which are granted in subframe [na, n-1] and in subframe [n, n + b], during the [na, n + b] transmission pool. It may mean divided by the number of sub-channels set in.
  • the CR may be applied at the RRC_IDLE intra frequency, the RRC_IDLE inter frequency, the RRC_CONNECTED intra frequency, and / or the RRC_CONNECTED inter frequency.
  • a may be a positive integer and b may mean 0 or a positive integer.
  • the CR can be evaluated for each (re) transmission.
  • the UE may assume that a transmission parameter used in subframe n can be reused according to an existing permission in subframe [n + 1, n + b] without packet drop.
  • the subframe index may be based on the physical subframe index.
  • CR may be calculated for each priority level.
  • S-RSSI Segment Signal Strength Indicator
  • PSSCH-RSRP PSSCH Reference Signal Receiver Power
  • S-RSSI Sidelink RSSI
  • S-RSSI Sidelink RSSI
  • S-RSSI Sidelink RSSI
  • S-RSSI is a subframe configured in 1, 2, ..., 6 SC-FDMA symbols of the first slot of a subframe and 0, 1, ..., 5 SC-FDMA of the second slot. It may be defined as a linear average of total received power (in [W]) per SC-FDMA observed by the terminal only in the channel
  • Sidelink RSSI (S-RSSI) may be defined as the linear average of the total received power (in [W]) per SC-FDMA symbol observed by the UE only in the configured sub-channel in SC-FDMA symbols 1, 2, ..., 6 of the first slot and SC-FDMA symbols 0, 1, ..., 5 of the second slot of a subframe).
  • the reference point of the S-RSSI may be an antenna connector of the terminal.
  • the reported value may not be lower than the corresponding S-RSSI of any individual diversity branch.
  • S-RSSI may be applied at the RRC_IDLE intra frequency, the RRC_IDLE inter frequency, the RRC_CONNECTED intra frequency, and / or the RRC_CONNECTED inter frequency.
  • the PSSCH-RSRP may be defined as a linear average of power contributions (in [W] units) of a resource element carrying a demodulation reference signal associated with the PSSCH, in the PRBs indicated by the associated PSCCH (PSSCH Reference Signal Received Power).
  • PSSCH-RSRP may be defined as the linear average over the power contributions (in [W]) of the resource elements that carry demodulation reference signals associated with PSSCH, within the PRBs indicated by the associated PSCCH).
  • the reference point for the PSSCH-RSRP may be an antenna connector of the terminal.
  • the reported value may not be lower than the corresponding PSSCH-RSRP of any individual diversity branch.
  • the PSSCH-RSRP may be applied at the RRC_IDLE intra frequency, the RRC_IDLE inter frequency, the RRC_CONNECTED intra frequency, and / or the RRC_CONNECTED inter frequency.
  • the power per resource element may be determined from the energy received in the useful part of the symbol, except for the CP.
  • the V2X terminal may perform V2X communication through resource reservation based on the CBR.
  • resource reservation when resource reservation is performed once by the V2X terminal, it may take a long time until the resource is rebooked.
  • the CBR may change even after resource reservation is performed.
  • the V2X terminal when the V2X terminal performs resource reservation based on the CBR, the V2X terminal had to perform V2X communication based on the CBR before the change for a while even when the CBR changed after the resource reservation.
  • the terminal when the terminal performs V2X communication based on the existing CBR even after the CBR is changed, when the CBR is increased after resource reservation (for example, the ratio of subchannels occupied by other terminals after resource reservation is increased). Also, since the terminal performs V2X communication based on the CBR before the change, the possibility that the V2X communication of the terminal is interrupted by the V2X communication of another terminal may increase.
  • the present invention provides a method for performing V2X communication by reflecting the changed CBR when the CBR is changed, and an apparatus using the same.
  • the proposed schemes below can be used to pre-set (/ signaled) CBR measurements and / or V2X message priorities when a CBR measurement is changed (before resource rescheduling is triggered) after resource reservation is performed.
  • Star The method to apply the RADIO-LAYER (TX) PARAMETER restriction efficiently.
  • the proposed schemes of the present invention may be limitedly applied only when the change (width) of the CBR measurement value is larger than a preset (/ signaled) threshold.
  • a preset (/ signaled) threshold for example, when a change of the RADIO-LAYER (TX) PARAMETER is required (when resource rebooking is performed) due to a change in the CBR measurement value (above the preset (/ signaled) threshold width), the probability-based existing (reservation) is required. It may be possible not to perform an operation of determining whether to reuse (/ hold) a resource.
  • FIG. 7 is a flowchart illustrating a method of performing V2X communication according to an embodiment of the present invention.
  • the UE may determine whether the CBR measurement value is changed after resource reservation is performed (before resource re-reservation is triggered) (S710).
  • the terminal may be a V2X terminal, CBR is as described above.
  • the terminal performs V2X communication based on the determination, but if the CBR measurement value is changed after resource reservation is performed (before the resource re-scheduling is triggered), based on the changed CBR measurement value (preset / Signaled) may perform V2X communication based on the RADIO-LAYER (TX) PARAMETER restriction (S720).
  • the V2X terminal is limited to RADIO-LAYER (TX) parameter (preset (/ signaled)).
  • TX RADIO-LAYER
  • the V2X communication may be performed based on the changed frequency resource.
  • the V2X terminal may perform the V2X communication based on the reduced frequency resource.
  • the V2X terminal may perform the V2X communication based on the reduced frequency resource and / or the existing time resource. More specific details of the present example will be described later for convenience of description.
  • the V2X terminal is assigned to a subset of existing frequency resources and / or existing time resources.
  • the V2X communication may be performed based on this.
  • the V2X terminal may perform the allowed number of transmissions using a subset of the (time) resources reserved in the existing period. More specific details of the present example will be described later for convenience of description.
  • the V2X terminal may signal change information of a transmission period.
  • the V2X terminal may signal information on whether to retransmit.
  • the V2X terminal may signal information on the remaining transmission number. More specific details of the present example will be described later for convenience of description.
  • the V2X terminal may determine that the CBR value is changed after the resource reservation is performed (before the resource rebooking is triggered). More specific details of the present example will be described later for convenience of description.
  • the number of frequency resources eg, PSSCH RB
  • MCS multiplexing resource control
  • transmit power and / or the number of retransmissions per TB is changed according to a previously set (/ signaled) RADIO-LAYER (TX) PARAMETER limit, but the (existing) time resource reservation-related PSCCH information (e.g. performing retransmissions) Whether or not (retransmission) resource reservation information) can be changed.
  • the (related) PSCCH information is updated according to the changed (/ reduced) number of frequency resources (and / or MCS), while the ((RADIO-LAYER (TX) PARAMETER limit is applied).
  • the time resource reservation related PSCCH information remains the same as before (eg, when performing retransmission).
  • the rule through the application of the rule, it is possible to fully reflect the RADIO-LAYER (TX) PARAMETER restriction (according to the changed CBR measurement value) without performing the resource rescheduling operation.
  • FIG. 8 is a flowchart illustrating an example of a method of performing V2X communication according to the proposed method # 1.
  • the terminal may determine whether the CBR measurement value is changed after resource reservation is performed (before resource rebooking is triggered) (S810).
  • the terminal may perform V2X communication based on the changed number of frequency resources (S820). That is, when the CBR measurement value is increased after the resource reservation is performed (before the resource re-reservation is triggered), the terminal may adjust only the number of frequency resources without adjusting transmission in the time resource.
  • the terminal when the terminal performs transmission control not only in frequency resources but also in time resources, the terminal may not perform transmission at a specific time point. If the terminal does not perform transmission at a specific time point, the other terminal may determine that the specific time point is not congested, and then perform V2X communication by reserving resources associated with the specific time point. As such, when the terminal performs transmission control up to a time resource, a transmission congestion situation between the terminal and the other terminal may occur. In this case, in the proposed method # 1, a configuration of limiting only frequency resources is provided, so the above problem can be prevented.
  • FIG. 9 schematically illustrates an example of a configuration for limiting frequency resources in the proposal method # 1.
  • the number of frequency resources may be reduced along the frequency axis.
  • the reduced frequency region is illustrated as being the lower end of the subchannel, but the reduced frequency region is not limited to the lower end of the subchannel. In other words, the reduced frequency domain may be at the top, the middle, or distributed of the subchannel.
  • transmission control in time resources is not necessarily limited.
  • the RADIO which has been previously set (/ signaled) in the form of a subset of the previously reserved (time / frequency) resources (if the CBR measurement is high (after the resource reservation has been performed, but before the resource rescheduling is triggered)).
  • -LAYER (TX) Explains an example of changing according to the PARAMETER restriction.
  • T e.g., "2T”
  • the transmission may be performed using only a subset of the existing reserved (frequency) resources (areas).
  • (A) the (related) PSCCH information is updated according to the changed (/ reduced) number of frequency resources (as in [Proposal # 1]), while the time resource reservation is related.
  • PSCCH information e.g. whether retransmission is performed and (retransmission) resource reservation information
  • PSCCH information may remain the same (even if retransmission (and / or some (period) transmission) is actually omitted)
  • FIG. 10 is a flowchart illustrating an example of a method of performing V2X communication according to the proposed method # 2.
  • the terminal may determine whether the CBR measurement value is changed after resource reservation is performed (before resource re-reservation is triggered) (S1010).
  • the UE may perform V2X communication based on a previously reserved time and / or a subset of frequency resources (S1020). That is, after the resource reservation is performed (before the resource re-reservation is triggered), if the CBR measurement value is high, the terminal may also adjust the time resource.
  • the CBR measurement value becomes high (after resource reservation is performed (before resource re-scheduling is triggered)) (either existing (eg, “RESERVED FIELD”) or newly defined on the PSCCH Field), (A) whether the transmission period has changed (/ increased) (and / or changed (/ increased) period information and / or the rate of existing transmissions that are omitted) (e.g.
  • the terminal may determine that the transmitting terminal omits transmission at some existing period of time) and / or (B) information on the remaining number of transmissions based on the existing CR_LIMIT (for example, the receiving terminal may be associated with the transmitting terminal).
  • the DTX detection of the V2X message may be signaled (implicitly, it may be understood that transmission in some existing periods of time) may be omitted (according to the changed (/ reduced) CR_LIMIT).
  • 11 is a flowchart illustrating an example of a method of performing V2X communication according to the proposed method # 3.
  • the UE may determine whether the CBR measurement value is changed after resource reservation is performed (before resource re-reservation is triggered) (S1110).
  • the UE may signal change information of the transmission period and / or remaining transmission number information through a specific field (S1120). .
  • the terminal may increase the reservation period or may not perform retransmission.
  • the terminal may transmit information about the increased reservation period to another terminal.
  • the terminal does not perform retransmission, the terminal does not perform retransmission.
  • the indicating information may be transmitted to another terminal.
  • a resource section reserved by the terminal for example, a resource for a relatively long section is reserved or compared with the number of times the actual transmission is performed, compared to a section where the transmission is actually performed.
  • the receiving terminals may know that the transmitting terminal omits transmission at some existing periods according to the CR_LIMIT (based on the changed CBR). That is, in the proposed method # 3, the terminal may transmit information related to how far the terminal will perform at a specific time point.
  • the remaining transmission number information may indicate that the transmission will be performed three more times in the future. Can be.
  • the RADIO-LAYER (TX) PARAMETER constraint range LIMRNG _A
  • the LAYER (TX) PARAMETER limit range LIMRNG _B
  • A the intersection (limit) between LIMRNG_A (eg RB SIZE 3-10) and LIMRNG_B (eg RB SIZE 5-8) )
  • LIMRNG_A eg RB SIZE 3-10
  • LIMRNG_B eg RB SIZE 5-8
  • RB SIZE 5-8 select the RADIO-LAYER (TX) PARAMETER (final) and / or (B) the minimum value of LIMRNG_A and LIMRNG_B (e.g. LIMRNG_A / LIMRNG_B (PSSCH) select RADIO-LAYER (TX) PARAMETER according to the minimum number of RBs (and / or the number of retransmissions per TB) and / or (C) there is no intersection (limit) range between LIMRNG_A and LIMRNG_B RADIO-LAYER (TX) PARAMETER line based on LIMRNG_B (or LIMRNG_A) (if previously defined) You can also (preferably) perform a tack.
  • TX RADIO-LAYER
  • the UE uses a RADIO-LAYER (TX) PARAMETER that satisfies LIMRNG_A and LIMRNG_B (maximum) for V2X communication, so that the overall system performance / stability (or V2X communication reliability) May be useful.
  • TX RADIO-LAYER
  • the present invention has been described a proposal method based on the 3GPP LTE system for convenience of description, the scope of the system to which the proposed method is applied can be extended to other systems in addition to the 3GPP LTE system.
  • D2D communication means that the UE communicates directly with another UE using a wireless channel, where, for example, the UE means a terminal of a user, but network equipment such as a base station is used for communication between UEs. Therefore, when transmitting / receiving a signal, it can also be regarded as a kind of UE.
  • the proposed schemes of the present invention may be limitedly applied only to the MODE 3 V2X operation (and / or the MODE 4 V2X operation). Further, as an example, the proposed schemes of the present invention may be limitedly applied only when the CBR measurement value is increased (and / or lowered) after the resource reservation is performed (before the resource rebooking is triggered).
  • FIG. 12 is a block diagram illustrating a terminal in which an embodiment of the present invention is implemented.
  • the terminal 1100 includes a processor 1110, a memory 1120, and an RF unit 1130.
  • the processor 1110 may execute a function / operation / method described by the present invention. For example, the processor 1110 determines whether a Channel Busy Ratio (CBR) value has changed after resource reservation is performed, and performs V2X communication based on the determination, but after the resource reservation is performed When the CBR value is changed, the V2X communication may be performed based on the changed CBR value.
  • CBR Channel Busy Ratio
  • the RF unit 1130 is connected to the processor 1110 to transmit and receive a radio signal.
  • the processor may include application-specific integrated circuits (ASICs), other chipsets, logic circuits, and / or data processing devices.
  • the memory may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device.
  • the RF unit may include a baseband circuit for processing a radio signal.
  • the above-described technique may be implemented as a module (process, function, etc.) for performing the above-described function.
  • the module may be stored in memory and executed by a processor.
  • the memory may be internal or external to the processor and may be coupled to the processor by various well known means.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Databases & Information Systems (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

L'invention concerne un procédé de fonctionnement de véhicule-à-toute-entité (V2X) exécuté par un terminal V2X dans un système de communication sans fil, le procédé consistant : à déterminer si une valeur de rapport d'occupation de canal (CBR) a changé après l'exécution d'une réservation de ressource ; à exécuter une communication V2X sur la base de la détermination, si la valeur de rapport CBR a changé après l'exécution de la réservation de ressource, la communication V2X étant exécutée sur la base de la valeur de rapport CBR modifiée.
PCT/KR2018/000640 2017-01-12 2018-01-12 Procédé de fonctionnement de communication véhicule-à-toute-entité (v2x) exécuté par un terminal v2x dans un système de communication sans fil et terminal l'utilisant WO2018131947A1 (fr)

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KR1020197018556A KR102524101B1 (ko) 2017-01-12 2018-01-12 무선 통신 시스템에서 v2x 단말에 의해 수행되는 v2x 통신 수행 방법 및 상기 방법을 이용하는 단말
US16/477,162 US10939469B2 (en) 2017-01-12 2018-01-12 V2X communication method executed by V2X terminal in wireless communication system, and terminal using same
CN201880008932.7A CN110249690B (zh) 2017-01-12 2018-01-12 在无线通信系统中由v2x终端执行的v2x通信方法和使用该方法的终端
EP18738639.6A EP3554172B1 (fr) 2017-01-12 2018-01-12 Procédé de fonctionnement de communication véhicule-à-toute-entité (v2x) exécuté par un terminal v2x dans un système de communication sans fil et terminal l'utilisant

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US201762445719P 2017-01-12 2017-01-12
US62/445,719 2017-01-12

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EP3554172A1 (fr) 2019-10-16
US10939469B2 (en) 2021-03-02
US20190373637A1 (en) 2019-12-05
KR102524101B1 (ko) 2023-04-20
EP3554172A4 (fr) 2019-12-04
CN110249690B (zh) 2022-10-25
EP3554172B1 (fr) 2021-09-22
KR20190098156A (ko) 2019-08-21

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